diff --git a/e2e/api-spec.json b/e2e/api-spec.json
index 873135539..bb8439481 100644
--- a/e2e/api-spec.json
+++ b/e2e/api-spec.json
@@ -64,6 +64,9 @@
       },
       "get": {
         "operationId": "CatsController_findAll",
+        "x-multiple": {
+          "test": "test"
+        },
         "x-codeSamples": [
           {
             "lang": "JavaScript",
@@ -160,7 +163,9 @@
           }
         },
         "tags": [
-          "cats"
+          "cats",
+          "tag2",
+          "tag1"
         ],
         "security": [
           {
diff --git a/e2e/src/cats/cats.controller.ts b/e2e/src/cats/cats.controller.ts
index 1ea981fea..89300f136 100644
--- a/e2e/src/cats/cats.controller.ts
+++ b/e2e/src/cats/cats.controller.ts
@@ -59,6 +59,9 @@ export class CatsController {
   @ApiExtension('x-codeSamples', [
     { lang: 'JavaScript', source: "console.log('Hello World');" }
   ])
+  @ApiExtension('x-multiple', { test: "test" })
+  @ApiTags("tag1")
+  @ApiTags("tag2")
   findAll(@Query() paginationQuery: PaginationQuery) {}
 
   @ApiQuery({ type: PaginationQuery })
diff --git a/e2e/validate-schema.e2e-spec.ts b/e2e/validate-schema.e2e-spec.ts
index d3f29fa39..4e97c9427 100644
--- a/e2e/validate-schema.e2e-spec.ts
+++ b/e2e/validate-schema.e2e-spec.ts
@@ -59,6 +59,11 @@ describe('Validate OpenAPI schema', () => {
       expect(api.paths['/api/cats']['get']['x-codeSamples'][0]['lang']).toEqual(
         'JavaScript'
       );
+      expect(api.paths['/api/cats']['get']['x-multiple']['test']).toEqual(
+        'test'
+      );
+      expect(api.paths['/api/cats']['get']['tags']).toContain('tag1');
+      expect(api.paths['/api/cats']['get']['tags']).toContain('tag2');
     } catch (err) {
       console.log(doc);
       expect(err).toBeUndefined();
diff --git a/lib/decorators/helpers.ts b/lib/decorators/helpers.ts
index a16fc634c..899b6e78e 100644
--- a/lib/decorators/helpers.ts
+++ b/lib/decorators/helpers.ts
@@ -86,7 +86,15 @@ export function createMixedDecorator<T = any>(
     descriptor?: TypedPropertyDescriptor<any>
   ): any => {
     if (descriptor) {
-      Reflect.defineMetadata(metakey, metadata, descriptor.value);
+      let metadatas: any;
+      if (Array.isArray(metadata)) {
+        const previousMetadata = Reflect.getMetadata(metakey, descriptor.value) || [];
+        metadatas = [...previousMetadata, ...metadata];
+      } else {
+        const previousMetadata = Reflect.getMetadata(metakey, descriptor.value) || {};
+        metadatas = {...previousMetadata, ...metadata};
+      }
+      Reflect.defineMetadata(metakey, metadatas, descriptor.value);
       return descriptor;
     }
     Reflect.defineMetadata(metakey, metadata, target);